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 A059729 Carryless squares n X n base 10. 23
 0, 1, 4, 9, 6, 5, 6, 9, 4, 1, 100, 121, 144, 169, 186, 105, 126, 149, 164, 181, 400, 441, 484, 429, 466, 405, 446, 489, 424, 461, 900, 961, 924, 989, 946, 905, 966, 929, 984, 941, 600, 681, 664, 649, 626, 605, 686, 669, 644, 621, 500, 501, 504, 509, 506, 505 (list; graph; refs; listen; history; text; internal format)
 OFFSET 0,3 LINKS David Applegate, Marc LeBrun and N. J. A. Sloane, Carryless Arithmetic (I): The Mod 10 Version. EXAMPLE a(87) is carryless sum of (6)400, (5)60, (5)60 and (4)9, i.e., 400+20+9 = 429. PROG (Python) def A059729(n):     s = [int(d) for d in str(n)]     l = len(s)     t = [0]*(2*l-1)     for i in range(l):         for j in range(l):             t[i+j] = (t[i+j] + s[i]*s[j]) % 10     return int("".join(str(d) for d in t)) # Chai Wah Wu, Jun 29 2020 CROSSREFS Cf. A004520, A059692, A169889, A169963. See A087019 (lunar squares) for another version. Sequence in context: A008959 A316347 A169917 * A184988 A108533 A200414 Adjacent sequences:  A059726 A059727 A059728 * A059730 A059731 A059732 KEYWORD base,nonn AUTHOR Henry Bottomley, Feb 20 2001 STATUS approved

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Last modified September 23 09:03 EDT 2020. Contains 337298 sequences. (Running on oeis4.)